fix: otp input field single input limit in auth

src/app/auth/page.tsx

@@ -79,6 +79,7 @@ function AuthIndex({ }: Props) {
             const prev = otp.padEnd(6).split('');
             prev[index] = e.target.value;
             const next = prev.join('');
+            if(otp.length >= 6 && next.trim().length >= otp.length) return;
             setOtp(next.trimEnd());
         }
     }